Improvement in machines for bending tubes



J. M. EVA HTS. Machine for Bending Tubes.

No. 223,037. Patented Dec. 30,1879.-

mr/vfssis UNITED STATES PATENT OFFICE.

JAMES M. EVARTS, OF NEW HAVEN, CONNECTICUT.

IMPROVEMENT IN MACHINES FOR BENDING TUBES.

Specification forming part of Letters Patent No. 223,037, dated December30, 1879; application filed August 13, 1879. i

To all whom it may concern:

Be it known that I, JAMES M. EVARTS, of New Haven, in the county of NewHaven and State of Connecticut, have invented a new and Improved Machinefor Bending Pipe, of of which the following is a specification.

My invention relates to machines for bending pipe of the kind ordinarilyused in buildings for distributing water and gas; andit consists in newcombinations and elements, which are more fully described and claimed inthe following specification.

In the drawings, which I hereby make a part of this specification,Figure 1 is a plan of the machine. Fig. 2 is a plan of a part of itsframe or base. Fig. 3 is a view of the upper cap; and Fig. 4 a view ofthe lower cap re versed. Fig. 5 shows the roller and its groove. Fig. 6shows the stud, with its nut, on which several of the parts turn. Fig. 7is a crossseotion of one part, and Fig. 8 a view of the handle. Fig. 9is a vertical section of a portion of the machine, showing its principalworking parts.

To enable those skilled in this class of ma chines to make and use myimproved machine, I will describe its parts and their operation.

A is the frame or base of the machine, and has the upright partsindicated by the letter a. B, Fig. 6, is a bolt on which the parts turn,and has the rectangular groove b. C, Figs. 1 and 6, is a part turning onthe shoulder m, Figs. 4 and 9, and has a socket, into which the leverfits, as shown by the dotted lines in Fig. 1. D, Figs. 1 and 9, is apart pivoted to the part C, as shown in Fig. 9, and carries the slide E,Figs. 1 and 9.

The slide E is rectangular, moves in a root angular groove in the partD, and has a circular groove on its end, as shown in Fig. 9. It is heldin its place by the rod 0, which turns in bearings attached to the partD, as shown in Fig. 1. The rod 0 is curved or bent, and by turningpresses on the part E. A setscrew, d, Figs. 1 and 9, adjusts the part E.A stop, 0, Fig. 1, limits the motion of the part D. A set-screw, m, Fig.1, operating as a gage, also limits the motion of the part D anddetermines the curvature of the pipe. The lever is of the form shown inFig. 8, and partially shown by dotted lines in Fig. 1. A

The cap F is reversed, as shown in Fig. 4, and has the shoulders m andit. (Better shown in Fig. 9.) It also has notches, as shown, which fiton the ways 0, Fig. 1.

The roller G, Figs. 5 and 9, is of the form shown in the figures, andhas the groove 9, specially adapted to a pipe of a particular size. Oneroller will only bend pipe of the same size, and there must be as manyrollers as there are sizes of pipe to be bent, with grooves speciallyadapted to the several sizes.

The cap H, Figs. 3 and 9, has notches, as

shown, which fit on the ways 0, Fig. 1. By

means of the cap H and cap F, with its shoulders m and n, the strain ispartially transmitted to the frame and the bolt relieved.

The part I, Fig. 1, has one of its ends pivoted to the frame, and theother end has a slot fitting the groove 11 in the bolt. It holds theparts on the bolt and allows the rollers to be changed readily.

The part K, Fig. 1, is a straight removable part, rests on the uprightparts of the frame, and has a circular groove on the side toward theroller, as shown in section in Fig. 7. The rollers M and N turn on studsattached to the frame, and allow the part K to move easily.

To bend pipe by the above-described machine, the pipe is placed on theupright parts of the machine and between the roller. G and part K in thegrooves of the two parts. The part D is then turned parallel with thepart C, the slide E being adjusted by the set-screw d to clasp the pipein the grooves of the two parts. As the lever is turned toward thesetscrew m the pipe is firmly grasped in the grooves of the roller andslide and carried forward,

the three rollers are set in motion, and the pipe bent to any extentrequired. As the groove in the roller G is made to fit the pipe, thepipe cannot spread and flatten, and as there is no sliding of the pipeon the roller G the stretching of the pipe is on its outer curve.

By means of the set-screw or gage m the pipe may be bent to any requiredangle, and different pieces of pipe to the same angle.

When the lever and parts connected with it 2. The combination, with thelever, roller are brought back to the position shown in Fig. G, part (J,part D, slide E, and set-screw d,,of

1 the bent pipe may be removed from the machine.

Having described my improved machine, What I claim as new, and desire tosecure by Letters Patent, is-

1. The roller G, in combination with thelever, part 0, part D, slide E,and set-screw d, all the said parts constructed and combinedsubstantially as set forth.

the grooved part K, and rollers M and N, as set forth.

JAMES M. EVARTS.

Witnesses:

GEORGE TERRY, WM. F. HOPSON.

